electron gun

noun Electronics, Television.
a device consisting of the cathode ray tube, which emits electrons, and a surrounding electrostatic or electromagnetic apparatus, which controls, focuses, and accelerates the stream of electrons (electron beam)
Also called gun.


Origin:
1920–25

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
electron gun
 
n
a heated cathode with an associated system of electrodes and coils for producing and focusing a beam of electrons, used esp in cathode-ray tubes

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
electron gun  
The part of a cathode-ray tube that emits a narrow beam of electrons, consisting of a cathode, control grids, and usually a heater. Electrons are emitted from the cathode, which is typically heated by electric current to give the electrons escape energy. The electrons are then focused into a beam by the electric fields of the control grids.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

electron gun

electrode structure that produces and may control, focus, and deflect a beam of electrons, as in a television picture tube (see ), where the beam produces a visual pattern on the tube's screen. The source of the electron beam is the cathode, a flat metal support covered with oxides of barium and strontium. When heated by a coil behind the support, these oxides emit electrons, which are drawn toward a positively charged sleeve (first anode) that is contoured to allow the electron beam to flow within the inside diameter. The beam is then electrostatically constricted and collimated by a metal disk with a hole (the control electrode) before it is directed to strike a phosphor-coated screen

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
So encouraging are the results that a second electron gun is planned.
The electron gun solenoid is designed with water-cooled hollow conductors,
  pancake-style coils and no iron return.
Direct view televisions have a cathode ray tube with a scanning electron gun.
The e-beam is a stream of high energy electrons, propelled out of an electron
  gun.
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